// Copyright (C) Kumo inc. and its affiliates.
// Author: Jeff.li lijippy@163.com
// All rights reserved.
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU Affero General Public License as published
// by the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU Affero General Public License for more details.
//
// You should have received a copy of the GNU Affero General Public License
// along with this program.  If not, see <https://www.gnu.org/licenses/>.
//


#pragma once

#include <chrono>
#include <functional>

#include <pollux/dwio/common/unit_loader.h>

namespace kumo::pollux::dwio::common {
    class OnDemandUnitLoaderFactory
            : public pollux::dwio::common::UnitLoaderFactory {
    public:
        explicit OnDemandUnitLoaderFactory(
            std::function<void(std::chrono::high_resolution_clock::duration)>
            blockedOnIoCallback)
            : blockedOnIoCallback_{std::move(blockedOnIoCallback)} {
        }

        ~OnDemandUnitLoaderFactory() override = default;

        std::unique_ptr<pollux::dwio::common::UnitLoader> create(
            std::vector<std::unique_ptr<pollux::dwio::common::LoadUnit> > loadUnits,
            uint64_t rowsToSkip) override;

    private:
        std::function<void(std::chrono::high_resolution_clock::duration)>
        blockedOnIoCallback_;
    };
} // namespace kumo::pollux::dwio::common
